Feature: add note and notebook

[OkieLe]

Changes

• Add Log
• Show notebooks in drawer: FileManager
  • Init load
  • Expand and collapse
• Add notebook from drawer icon/option menu
  • Show a dialog for user to input notebook name
  • Refresh the notebooks list in drawer after addition
  • Allow sub folder
• Delete notebook from option menu
  • Show a dialog for user to confirm
  • Refresh the notebooks list in drawer after deletion
• Edit notebook from option menu
  • Show a dialog for user to change notebook name
  • Refresh the notebooks list in drawer after update
• Technical
  • Modular for DI across modules
  • BLoC for in-module state management, business logic